Multiple Choice
A system receives 575 J of heat and does 425 J of work on the surroundings. Calculate the change in the internal energy, ΔE, of the system.
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8. Thermochemistry
First Law of Thermodynamics
Multiple Choice
Which law allows the calculation of calories by measuring heat transfer between substances?
A
Boyle's Law
B
First Law of Thermodynamics
C
Law of Conservation of Mass
D
Second Law of Thermodynamics
Verified step by step guidance1
Understand that the problem is asking which law relates to calculating calories by measuring heat transfer between substances.
Recall that Boyle's Law deals with the relationship between pressure and volume of gases, so it is not directly related to heat transfer or calories.
Recognize that the Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction, which does not involve heat transfer calculations.
Consider the Second Law of Thermodynamics, which deals with entropy and the direction of spontaneous processes, but does not directly provide a method for calculating heat transfer or calories.
Identify that the First Law of Thermodynamics, which is the law of energy conservation, relates changes in internal energy to heat added and work done, allowing calculation of heat transfer (and thus calories) between substances.
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